I have a 2004 chevy avalanche. The heater only blowes cold air.
The ac works but when the air is being taken from the cabin it seams to make a noise if it is blocked, but air is still coming out of vent.

Hi! The heater may not be working for the heater coil is faulty, you will need to have it replaced. Regarding the unusual sound, the air box may have a loose air distributor or something that needs to be secured. Hope this helps and thank you for using FixYa!

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this problem is caused in almost all cases by a failed actuator that moves the door insiode the heating/ac duct to change the outlet temperature, it is called the Air Temperature Control Blend Door actuator.

There is a fan control module mounted in the air plenum that is known for going bad.Check the connector where it plug's in under the case below the glove box for a burnt connection.Usually the connectors will melt but it can still be bad where it goe's into case.It need's airflow to cool the resistor,s for the differant blower speeds.